Abstract
Time differential perturbed angular correlation spectra of181Ta produced by beta decay of181Hf in monoclinic ZrO2 have been measured over a temperature range 10K to 1300K. If times near t=0 are excluded, G2(t) is well fitted by a standard single site model for nuclei subject to an interaction with a static electric field gradient. For high purity samples, the effective anisotropy A2 is equal to its expected value above 200°C but decreases abruptly by approximately a factor of two for lower temperatures. This unusual decrease, which does not occur in natural crystals or in Nb-doped powders, is attributed to an aftereffect of the beta emission that populates with approximately 50% probability an electron trap located about one eV below the conduction band. At low temperatures, this trapped electron causes the Ta nucleus to relax rapidly and contributes to G2(t) only near t=0. At high temperatures or in doped samples the electron escapes quickly enough to have negligible effect on G2(t).
Similar content being viewed by others
References
H. Jaeger, J. A. Gardner, J. C. Haygarth, and R. L. Rasera J. Amer. Ceram. Soc. 69 (1986) 458.
Y. H. Chiao, PhD thesis, MIT, 1986 (unpublished).
A. G. Bibiloni, C. P. Massolo, J. Desimoni, L. A. Mendoza-Zelis, F. H. Sanchez, A. F. Pasquevich, L. Damonte, and A. R. Lopez-Garcia, Phys. Rev. B 32 (1985) 2393.
H. Haas and D. A. Shirley, J. Chem. Phys. 58 (1972) 3339.
Author information
Authors and Affiliations
Additional information
Supported in part by USDOE contract DE-FG06-85ER45191
Rights and permissions
About this article
Cite this article
Jaeger, H., Su, H.T., Gardner, J.A. et al. Aftereffects following β-decay of181Hf1 . Hyperfine Interact 60, 615–618 (1990). https://doi.org/10.1007/BF02399828
Issue Date:
DOI: https://doi.org/10.1007/BF02399828